Zhejiang Dongfeng Fluorite Company Concentrator

The plant designed in 1969 by the Institute of Design Shan steel. The design scale is 500t/d.

(1) ore properties: the genus deposit, deposit epithermal silicate fluorite type, occurs in substantially the Jurassic Mesozoic, the Cretaceous volcanic rocks, the multiple lithology tuff (rhyolitic) . The ore is generally in the form of a block, a strip, a breccia, or a honeycomb. Medium and fine grain structure, granular granite morphological structure and plaque-like structure. The massive fluorite is a collection of self-shaped and semi-automorphic grains closely embedded. The single crystal particle size is 0.3-2.5 mm, which is mainly cubic, followed by octahedron and rhombohedral dodecahedron, sometimes represented by quartz . malcrystalline; mostly quartz agglomerate, banded, an aggregate of crystal grains of 0.1 ~ 0.4mm; in addition, feldspar, calcite, clay and a small amount of sericite, chlorite and minor amounts of pyrite ore, magnetite ore and brass. Fluorite is mainly dense, partially granulated, and closely symbiotic with quartz. The particle size is extremely uneven. The fineness is only 0.01~0.02mm, embedded in quartz vein, generally 0.05~0.6mm, large reachable number. From millimeters to tens of millimeters. The gangue minerals are mainly quartz, which are in the form of metasomatism and filling. The former is divided into cryptocrystalline according to the different granularity of the granules. The particle size is less than 0.005mm, and the granules are mostly in the form of cryptocrystalline particles, and the content is about 50%. The multi-element analysis of ore is shown in Table 1. Table 1 Multi-element analysis of raw ore

The ore-rich ore contains an average of more than 250% CaF, and the average ore-poor content contains 30% to 50% of CaF2. The ore density is 2.86 g/cm3, the water content is 2%, the angle of repose is 38°, and the Platts hardness is 4.

(2) Process flow: The whole mine consists of more than ten mines in three mining areas (Yangjia, Zhouling, Huajie) (Yangjia, Jiangmadong, Chen Dakeng, Linglong, Huajie, Zhouling, Xulin, Wu Tail dragon, cold water pit, etc.). Beneficiation two parts, in order to meet the production requirements of metallurgical steel grade fluorspar, each selected from the mining chamber provided artificial hand, hand-selected sub-chamber chunks, blocks, small hand-selected, ore through the grate and vibrating sieving It is more than 200mm, 200~30mm, 30~15mm and 15~0mm, and is manually transported to the large, medium and small hand-selected rooms for manual hand selection, selecting fluorite concentrate and lean ore, concentrate Small electric motor vehicles are transported to the concentrate warehouse and then exported by car. The lean ore is hoisted to the yard or transported by car to the concentrator. The quality of each hand-selected grade of fluorite concentrate was determined according to the specific requirements of the users at that time. The CaF2 content is generally required to be above 80%. The hand selection process is shown in Figure 1.

Figure 1 Hand-selection process of Dongfeng Fluorite Concentrator

The ore dressing plant is located in Yangjia Mining Area. It is a multi-mine point centralized concentrating plant. Since it was completed and put into production in 1971, it has undergone many transformations. In 1986, the ore dressing was three production series. The general characteristics of the process are stage grinding and stage. The selection, but the three series have their own characteristics. The first and second series are after the grinding of the original ore. After coarse grinding, the concentrate is re-grinded, and after six selections, the selected mines are returned to the previous operation in sequence. The sorting process is shown in Figure 2. The crushing and sieving equipment is shared with the three series. The three series selection process is basically the same as the first and second series, but it is more flexible than the first and second series. The refinement of the selected mine can be returned in sequence and re-selected. It can also be returned and re-selected. The mine circuit can be carried out as needed. At the same time, the neutral or weak acid pulp flotation was adopted and the new agent H1101 was adopted; the automatic control was realized in a section of the grinding circuit, and the selection process is shown in Fig. 3. The production process indicators are shown in Table 2. The unit consumption is shown in Table 3. The main equipment is shown in Table 4.

Figure 2 Process of the first and second series of Dongfeng Fluorite Concentrator

Figure 3 Dongfeng Fluorite Concentrator Three Series Process Flow Table 2 Mineral Processing Technology Index

Table 3 Unit consumption indicators (based on raw ore)

Table 4 Main equipment

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